Overuse of phony targets in makefile

[valpackett]

Hi, I'm working on packaging this in FreeBSD Ports. Ports has separate build stages, so I need to make finish and install separately. But because most targets are .PHONY, making install starts a rebuild from scratch! I have replaced install: finish with install: as a workaround, but it would be nicer if the makefile used Make dependency tracking to avoid rebuilds.

[sunfishcode]

#154 is working on a CMake-based replacement for the current Makefile, which should address these issues.